His foot has looked like this for about a year now, it's not bothering him or anything. I called my vet when it first started looking like this a she said probably cause it was so dry out and I should make sure he gets in mud cause that helps. Then I asked my horse shoer about it and he said to put a little water and bleach and brush it on once a week so I did that and it still looks like that. Like I said it's not bothering him its just that it doesn't look very pretty. Is there something else I can do?